ELECTRONICALLY CONTROLLED BRAKE SYSTEM VSC does not Operate or VSC does not Operate Correctly

DESCRIPTION

When ABS, TRC or VSC is operating, the skid control ECU (brake booster with master cylinder assembly) blinks the slip indicator light to inform the driver that slippage occurred.

When a communication malfunction with the hybrid vehicle control ECU is detected, TRC and VSC are disabled. Also, TRC and VSC are disabled when a DTC is stored.

PROCEDURE


  1. BRAKE PROBLEM CHECK


    1. Check whether the slip indicator light was illuminated when VSC did not operate.

      OK
      The slip indicator light was illuminated.

      Tech Tips

      When a DTC is stored, the slip indicator light is illuminated and VSC does not operate due to the fail-safe function.

    2. Check whether the vehicle speed was 15 km/h (9 mph) or less when VSC did not operate.

      OK
      The vehicle speed was 15 km/h (9 mph) or less.

      Tech Tips

      VSC does not operate when the vehicle speed is 15 km/h (9 mph) or less.

    3. Check whether the vehicle was driven straight for a few seconds at 35 km/h (22 mph) or more.

      OK
      The vehicle was not driven straight for a few seconds at 35 km/h (22 mph) or more.

      Tech Tips

      When the power switch is turned on (IG), as steering angle sensor zero point calibration is not performed below 35 km/h (22 mph), VSC will not operate until the vehicle is driven straight for a few seconds at 35 km/h (22 mph) or more.

      Result
      Proceed to
      OK
      NG

    OK

    END

    NG

  2. CHECK DTC


    1. Clear the DTCs.

      Click here


      Chassis > ABS/VSC/TRC > Clear DTCs

    2. Turn the power switch off.

    3. Turn the power switch on (IG).

    4. Check the DTCs (electronically controlled brake system) that are output.

      Click here


      Chassis > ABS/VSC/TRC > Trouble Codes
      Result
      Result Proceed to
      DTCs are not output. A
      Electronically controlled brake system DTCs are output. B

    B

    REPAIR CIRCUITS INDICATED BY OUTPUT DTCS Click here

    A

  3. CHECK TIRES


    1. Check that the tire of each wheel is the correct size.

      Click here

      OK
      The tire of each wheel is the correct size.
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE THE TIRE OF EACH WHEEL WITH THE CORRECT SIZE

    OK

  4. CHECK AIRBAG SENSOR ASSEMBLY INSTALLATION


    1. Turn the power switch off.

    2. Check that the yaw rate and acceleration sensor (airbag sensor assembly) has been installed properly.

      Click here

      OK
      The yaw rate and acceleration sensor (airbag sensor assembly) is tightened to the specified torque.
      The yaw rate and acceleration sensor (airbag sensor assembly) is not tilted.
      Result
      Proceed to
      OK
      NG

    OK

    OBTAIN YAW RATE AND ACCELERATION SENSOR ZERO POINT Click here

    NG

    INSTALL AIRBAG SENSOR ASSEMBLY CORRECTLY Click here